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FrameNumber=19;
Row=11;
#3512(DAW)…(DAW)(^END)
10.6.1.2 RDD? - Read Frame Transfer
To download a frame of data from the LBA-PC, you must send the RDD? command along with
any optional parameter that identifies which frame you are requesting to transfer.
The frame parameter is optional and is numbered from -1 to n. ‘n’ is the number of frames in
the frame buffer. Frame -1 is the Gain Frame, 0 is the Reference frame, and frames 1 to n are
data captured in the frame buffer. If you do not send the frame number parameter then the
current frame is used.
The frame data is sent as a modified IEEE 488.2 Definite Length Arbitrary Block Response Data.
The number of bytes in a frame is two times the number of pixels. For example, a 128 X 120
frame consists of 30,720 bytes, a 256 X 240 frame consists of 122,880 bytes, etc. Each pixel is a
sixteen-bit two’s complement fixed point value having the form:
siiiiiii ifffffff LBA-300PC -256 to 255.9921875
siiiiiii iiifffff LBA-400PC -1024 to 1023.96875
siiiiiii iiiiifff LBA-500PC -4096 to 4095.875
siiiiiii ifffffff LBA-708PC -256 to 255.9921875
siiiiiii iiifffff LBA-710PC -1024 to 1023.96875
siiiiiii iiiiifff LBA-712PC -4096 to 4095.875
siiiiiii iiiiiiif LBA-714PC -16384 to 16383.5
Where:
s = sign bit
i = integer
f = fraction
Use the :FST? command to determine the specific fixed point format of pixels in a frame. The
PixelBits parameter specifies the number of integer bits. The PixelBitsFraction parameter
specifies the number of fraction bits. To convert a sixteen bit fixed point data word to a floating
point value, divide the data word by 2 raised to the power of PixelBitsFraction (128, 32, 8, or 2
for the LBA-300/708PC, LBA-400/710PC, or LBA-500/712PC, or LBA-714PC respectively).
The LBA-PC responds to the query by repeating RDD followed by three parameters specifying the
frame number, number of data columns, and number of data rows. Next comes the definite
length arbitrary block response data specification, which has the form:
#nd..d(DAW)…(DAW)
Operator’s Manual LBA-PC
Doc. No. 10654-001, Rev 4.10
189
Where: